Well, I've been wondering why Ghoul's tail isn't too "flowy" yet as I've had him for a few months now.
So, I checked some pictures of common Betta tails. And what do you know. One that I didn't know about caught my eye (I've heard this type is a bit on the rare size): he seems to be a Spade tail!
Will try to get some good pictures of him tomorrow, and see what your opinions are. I posted in advance because I was excited :D

Well, I only managed to grab one good pictrue of him. Is this enough to figure hit type out? Is he a spade?
Today, he also made his first bubble nest. He had some previous small attempts, but this is the only big one and he's still working on it :D

he does look spade, but am not sure though. pitluvs from the looks of the spade tail you show it happens to be a HMPK male betta (sorry if i sound rude) he might be but am not %100 percent sure about it yet

I really hope you're wrong.
From what I've read, he doesn't show any sign of beeing a female. No "white spot", he built a huge nest, the beard is quite obvious. I know these can't really be 100% sure, but what are the odds that he share so many common signs of beeing a male?